Valuation of treasure distributed in coin will be given in its value in silver, not the actual number of coins. Characters may end up with pouch valued at several thousand silver pieces, but in reality only have a medium pouch of gold.

For Encumbrance purposes: (This will likely only come into play with a large treasure haul, if ever.)
528 silver pieces = 1 kg
111 gold pieces = 1 kg (valued at 8,880 silver)